The situation is getting very sad all over the world. It seems that there are a lot of problems everywhere with bagged potting mixes containing compost or organic fertilizers.
Last year this couple from UK was investigating the issue with the grow bags:
https://youtu.be/lsQD0hIwnOI
I do not dare using any mix, which has compost marked as ingredient on the label or any fertilizer containing vinasse or molasses nor any bagged manure products. I experienced the problem 10 years ago, when using fertilizer containing vinasse. I have later found out that clopyralid is commonly used on sugar beet fields and vinasse is a byproduct of the sugar industry.
It is really frustrating situation, when the chemical fertilizers are actually safer to use than the commercial organic ones.
Sari